With the continuous advancement of urbanization, dog ownership has become the choice of more and more people. However, in cities, due to factors such as high population density and complex environment, the breeding of some large dogs has brought safety hazards to people. In order to maintain public safety and protect the personal safety of citizens, the city management department has formulated a series of regulations prohibiting the breeding of large dogs. 
First, let's take a look at which large dogs are explicitly forbidden to keep in cities.
1.German Shepherd: The German Shepherd is an intelligent, alert, and well-trained dog breed, but they are larger in size, have a lot of strength, and are prone to being a threat to others.
2.Tibetan Mastiff: The Tibetan Mastiff is a loyal, brave, but independent dog breed that can easily cause harm to humans and other animals due to its large size, strength, and difficulty in being tamed.
3.Rottweiler: The Rottweiler is a strong, brave, and easily trained dog breed, but they are territorially strong and prone to attacking strangers.
4.Doberman: The Doberman Pinscher is an elegant, alert, and loyal dog breed, but due to its strong vigilance and sense of territory, it is prone to being a threat to others.
5.Saint Bernard: The Saint Bernard is a large and gentle rescue dog breed, but due to its great strength and territorial awareness, it is prone to causing harm to others.
For these banned large dog breeds, the city management department will strengthen supervision and law enforcement to ensure the personal safety of citizens and the maintenance of public order. At the same time, members of the public should also enhance their safety awareness and avoid contact with these large dogs to avoid accidents.
Of course, in addition to the banned large dog breeds, there are some other large dog breeds that are also considered unsafe or unsuitable, but they can vary from region to region, city, or country to country. Therefore, when choosing a dog breed, the public should fully understand the local regulations and requirements to ensure that the dog breed meets the laws and regulations and public safety requirements.
In addition, for citizens who have already raised banned large dog breeds, the management department will also take corresponding measures, such as persuasion, fines or confiscation of dogs. Therefore, the public should consciously abide by the relevant regulations and do not raise prohibited large dog breeds, so as not to bring unnecessary trouble and losses to themselves and others.